Journal
SCIENCE
Volume 367, Issue 6474, Pages 171-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaz0122
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Funding
- Australian Research Council [LP180100431, FT180100232]
- CITIC-CBMM Nb Steel Award Fund Program [2018FWNB30064]
- 2019 University of Sydney Postdoctoral Fellowship
- USYD-SJTU Partnership Award
- Australian Research Council [FT180100232, LP180100431] Funding Source: Australian Research Council
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Hydrogen embrittlement of high-strength steel is an obstacle for using these steels in sustainable energy production. Hydrogen embrittlement involves hydrogen-defect interactions at multiple-length scales. However, the challenge of measuring the precise location of hydrogen atoms limits our understanding. Thermal desorption spectroscopy can identify hydrogen retention or trapping, but data cannot be easily linked to the relative contributions of different microstructural features. We used cryo-transfer atom probe tomography to observe hydrogen at specific microstructural features in steels. Direct observation of hydrogen at carbon-rich dislocations and grain boundaries provides validation for embrittlement models. Hydrogen observed at an incoherent interface between niobium carbides and the surrounding steel provides direct evidence that these incoherent boundaries can act as trapping sites. This information is vital for designing embrittlement-resistant steels.
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